5. Boolean predicates

The core provides predicates for boolean values.

5.1. true? ↑

Function

(true? value) → boolean

Returns true if value is the boolean true, otherwise false.

(true? true)

true

(true? false)

false

(true? a)

false

(true? (boolean a))

true

Function

(false? value) → boolean

Returns true if value is the boolean false, otherwise false.

(false? true)

false

(false? false)

true

(false? nil)

false

(false? (boolean null))

true

(false? (boolean nil))

false